Adaptive modulation for MIMO spatial multiplexing systems with zero-forcing receivers in semi-correlated Rayleigh fading channels

ABSTRACT

We present and analyze a rate-adaptive multiple-input multiple-output (MIMO) spatial multiplexing system with linear zero-forcing (ZF) receiver in a semi-correlated flat Rayleigh fading channel with spatial correlation at the transmitter-side only. The goal is to maximize the average spectral efficiency (ASE) while satisfying a given bit error ratio (BER) constraint. We consider both continuous and discrete rate adaptation subject to an instantaneous as well as an average BER constraint. Furthermore, we investigate the benefit of using a linear prefilter at the transmitter, which is supposed to optimize transmission by exploiting knowledge of the spatial correlation properties of the channel for mapping a certain number of subchannels to the available transmit antennas. It is shown that the proposed system is capable of realizing very high ASEs and that linear prefiltering might be beneficially exploited for further improving the performance, particularly in highly correlated environments.

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INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.1 Network Architecture and Design
          Subjects: Wireless communication

Keywords:
MIMO systems, adaptive modulation, linear transmit prefiltering, spatial correlation, spatial multiplexing, zero-forcing receiver